Police in Daytona Beach, Florida, say they’ve thwarted a gunman’s plans to carry out a mass shooting at the Embry-Riddle Aeronautical University. On Thursday, police announced the arrest of 19-year-old John Hagins, who was carrying a backpack containing a collapsible semi-automatic rifle, ammunition and several magazines, including one loaded with 32 bullets. Police Chief Jakari Young says officers were alerted to the plot after two students reported Snapchat group messages they received from Hagins.

Jakari Young: “He referenced Columbine. He said once he was done at that firing range, he was going to campus to enact a Columbine. … By the grace of God, those two students came forward and thwarted that plan.”